AI SearchDynamics of nitrification in rotating biological contactors (Record no. 32167)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 03692nas a2200433 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260818094318.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 271098s1981 th r 000| eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b10216352 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Thesis no.EV-81-7 |
| 100 1# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Bravo, Helen E. |
| 245 10 - TITLE STATEMENT | |
| Title | Dynamics of nitrification in rotating biological contactors |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Bangkok : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 1981 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 69 leaves : |
| Other physical details | ill. |
| 490 1# - SERIES STATEMENT | |
| Series statement | Thesis ; |
| Volume/sequential designation | no. EV-81-7 |
| 500 ## - GENERAL NOTE | |
| General note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M.Eng.) - Asian Institute of Technology, 1981 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | A dynamic model was developed to represent the dynamic responses of nitrification in a fixed-film rotating biological contactor, the key feature of which is the use of the steady state kinetic model to describe substrate-uptake in the biofilm. Results of the experiment showed that during transient operations, a pseudo-steady state concentration distribution is established after a short lapse of time, in the diffusion layer and in the biofilm with respect to the bulk-liquid substrate concentration. There was a transient rise in the ammonia flux at the biofilm surface and the shift to steady state flux level was reached after a few disk rotations. Substrate-uptake rate was observed constant once a certain critical film thickness was exceeded and was not increased by further accumulation of microorganisms on the slime. It was also observed that the nitrifying bacteria exhibited a very small lag in growth rate when exposed to sudden changes in concentration. Furthermore, when the concentration of the products accumulated in excessive amounts it was observed that the out-diffusion of products from the internal pores of the biomass to the outer surface of the film affected the rate of substrate utilization resulting to process instability especially with long term transients. Conclusion based on engineering calculations are presented to illustrate design and operational mode for a more effective control of nitrification in dynamic systems. Simple forcing functions like pulse and step functions were used to verify the dynamic model in the zero-order regime; that is at bulk- ammonia concentration greater than 3 mg/l. Results of the experiment adequately verified the dynamic models developed. |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Sewage |
| General subdivision | Purification |
| -- | Rotating disc process |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Nitrification |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Watanabe, Yoshimasa, |
| Relator term | Chairperson |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Lohani, B.N., |
| Relator term | Co-Chairperson |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Chongrak Polprasert, |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | The Government of the Federal Republic of Germany, |
| Relator term | Scholarship Donor |
| 810 2# - SERIES ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Asian Institute of Technology. |
| Title of a work | Thesis ; |
| Volume/sequential designation | no. EV-81-7 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B21595">http://203.159.5.9/ait-thesis/detail.php?q=B21595</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b10216352 |
| b | mnait |
| c | x |
| 902 ## - LOCAL DATA ELEMENT B, LDB (RLIN) | |
| a | 250108 |
| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 2 |
| Cataloger's initials, CIN (RLIN) | 951012 |
| First date, FD (RLIN) | m |
| -- | a |
| -- | x |
| -- | 0 |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnarc |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 22-AIT Thesis (Replacement) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 40-Archives |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 20-AIT Publication |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120655864 |
| CREATED | CREATED : 2014-03-02 |
| RECORD Id | RECORD # : i12754456 |
| LPATRON | LPATRON : 0 |
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| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050160084751 |
| CREATED | CREATED : 2016-04-05 |
| RECORD Id | RECORD # : i12968511 |
| LPATRON | LPATRON : 0 |
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| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050121075310 |
| CREATED | CREATED : 2023-03-16 |
| RECORD Id | RECORD # : i13438256 |
| LPATRON | LPATRON : 0 |
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| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Cost, normal purchase price | Total checkouts | Full call number | Barcode | Date last seen | Copy number | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | 50.00 | AIT Thesis no.EV-81-7 | 30050120655864 | 18/08/2026 | 3 | 18/08/2026 | 22-AIT Thesis (Replacement) | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 18/08/2026 | AIT Thesis no.EV-81-7 | 30050160084751 | 18/08/2026 | 18/08/2026 | 40-Archives | ||||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | 50.00 | AIT Thesis no.EV-81-7 | 30050121075310 | 18/08/2026 | 1 | 18/08/2026 | 20-AIT Publication |